Backpack



FIG. 1 is a front view of a backpack showing my new design;

FIG. 2 is a perspective veiw thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a rear perspective view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a right perspective view in an open position;

FIG. 9 is an exploded front perspective view of the shell and pack;

FIG. 10 is an exploded side perspective view of the shell and pack;

FIG. 11 is a front perspective view of the pack portion; the shell being separated; and,

FIG. 12 is an inside perspective view of the shell portion, separated from the pack. 

I claim the ornamental design for a backpack, as shown and described. 